December weather in Riverside, WA
The average temperature in Riverside in December is 27.9°F (23.3°F–32.5°F). Average precipitation: 1.95 inches.
December is a winter month in Riverside, and is cooler than the annual average of 49.9°F. Daily temperatures swing about 9.2°F between overnight low and afternoon high. Expect about 12 days with precipitation. Daylight averages about 8h 6m. For travel, December is cold.
Avg High
32.5°F
Avg Low
23.3°F
Precipitation
1.95 in
Daylight
8h 6m
December records in Riverside
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| December 1 | 73.9°F (2021) | -1.8°F (2006) | 0.44 in (2001) |
| December 2 | 57.9°F (2021) | 0.1°F (2006) | 0.39 in (2012) |
| December 3 | 51.1°F (2012) | 10.9°F (2005) | 0.98 in (2015) |
| December 4 | 55.9°F (2007) | 1.9°F (2005) | 0.20 in (2012) |
| December 5 | 48.0°F (2012) | 1.2°F (2022) | 0.65 in (2015) |
| December 6 | 44.1°F (2003) | 3.9°F (2005) | 0.45 in (2015) |
| December 7 | 45.0°F (2023) | 1.9°F (2005) | 0.35 in (2015) |
| December 8 | 48.9°F (2025) | 1.0°F (2005) | 0.46 in (2004) |
| December 9 | 51.1°F (2025) | -1.8°F (2009) | 0.30 in (2004) |
| December 10 | 46.0°F (2025) | -2.7°F (2009) | 0.93 in (2022) |
| December 11 | 52.0°F (2021) | 0.1°F (2009) | 0.75 in (2006) |
| December 12 | 48.9°F (2025) | 4.1°F (2009) | 0.72 in (1998) |
| December 13 | 48.0°F (2025) | 3.0°F (2000) | 0.61 in (2021) |
| December 14 | 46.0°F (2002) | 1.9°F (2000) | 1.08 in (2002) |
| December 15 | 52.0°F (2002) | 5.2°F (2022) | 0.30 in (2002) |
| December 16 | 52.0°F (1999) | 4.1°F (2022) | 0.85 in (2002) |
| December 17 | 50.0°F (2025) | -0.8°F (2008) | 0.47 in (2024) |
| December 18 | 48.9°F (2018) | -2.9°F (2005) | 0.42 in (2007) |
| December 19 | 46.9°F (2018) | 1.2°F (2022) | 0.48 in (2019) |
| December 20 | 54.0°F (2020) | -2.7°F (2008) | 0.83 in (2014) |
| December 21 | 51.1°F (2014) | -3.8°F (2022) | 0.39 in (2009) |
| December 22 | 46.0°F (2014) | -8.9°F (2022) | 0.33 in (2012) |
| December 23 | 42.1°F (2014) | -1.8°F (2022) | 0.28 in (2016) |
| December 24 | 39.9°F (2014) | 7.2°F (2017) | 0.36 in (2003) |
| December 25 | 42.1°F (2005) | 5.2°F (2015) | 0.34 in (2002) |
| December 26 | 41.0°F (2025) | -4.9°F (2008) | 0.67 in (2024) |
| December 27 | 39.9°F (2004) | -1.8°F (2021) | 0.32 in (2002) |
| December 28 | 46.9°F (1998) | 2.1°F (2021) | 0.59 in (1998) |
| December 29 | 48.9°F (2011) | 1.2°F (2006) | 0.27 in (2011) |
| December 30 | 45.0°F (2011) | 1.0°F (2003) | 0.63 in (2005) |
| December 31 | 42.1°F (2023) | -2.7°F (2015) | 0.26 in (2009) |